Precor EFX 425 Precision Series Elliptical Cross Trainer Precor Cross Ramp technology adjusts the shape of the elliptical path your feet travel so you can target specific muscles Patented elliptical path perfectly mimics a natural running stride, allowing exercisers to keep their heels down and maintain proper biometrics 10 preset workouts help you stay challenged; built-in Work Out Accelerators suggest ways to get more out of your workout Use the console's headphone jack and on-screen volume control to safely & securely listen to music from your own player Touch sensor and wireless heart rate monitoring; works with any Polar-compatible wireless heart rate transmitter (sold separately)